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Difference between String and StringBuilder in C#?

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String

      Belongs to the System namespace.

      Immutable i.e. whenever you append a String object it creates a new object with new memory allocation.

      When changed, a new object is created and old object is destroyed.

      Avoid using inside loops, as if the loop executes N times. N memory allocation operations will be performed.

      Concat function is used for String concatenation.

Example:

string s = "Jack";

s = string.Concat(s, "Mike");

StringBuilder

      Belongs to the System.Text namespace.

      Mutable i.e. whenever you append a String object it does not creates a new object with new memory allocation.

      When changed, no new object is created or old object is destroyed.

      Recommended for loops, as only the size of object will change.

      Append function is used for String concatenation.

Example:

StringBuilder sb = new StringBuilder();

sb.Append("Jack");

sb.Append("Mike");

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